Process of etching glass.



UNITED STATES Iatentecl August 25, 1903.

BEN ZIN METH, OF nazoznowcn, AUSTRIA-HUNGARY.

PROCESS OF ETCHING GLASS.

SPECIFICATION forming part of Letters Patent No. 736,994, dated August 25, 1903. Application filed November 11,1902. erial No. 130,902. (No specimens.)

To all whom, it may concern.-

, Be it known that 1, BEN ZIN ll/I'ETH, a subject of the Emperor of Austria-Hungary, residing at Brzozdowce, Galicia, Austria-Hungary, have invented a new and Improved Process of Etching Glass, of which the following is a specification.

The present invention has reference to a new and improved process for etching patternssuch as pictures, ornamentations, and the like-upon glass or glassware, and relates more especially to a process which considerably simplifies the now known and adopted etching processes.

In carrying out the invention I treat the steel or zinc plate in the ordinary manner by applying to its face, in which the pattern to be transferred onto the glass is deeply etched, an ink made up of fluor ammonium, fluor acid, magnesia alba, white and yellow dextrine, and anilin-black. This ink has printing as well as etching properties. The ink is obtained in the following manner: About two parts of fiuor ammonium are mixed with one part of concentrated fiuor acid and allowed to stand for five to six hours. per clear liquor is then poured off and mixed with about thirty parts of water, seventy parts of pulverized magnesia alba, thirty parts white dextrine, twenty parts yellow dextrine, and five parts of deep-black anilin powder.

-I prefer to mix these ingredients in the following manner: The pulverized ingredients after having been carefully sieved are well intermixed by means of a Wooden stirrer. To this mixture is then added half of the fluorammonium and floor-acid solution and stirred until the mass commences to thicken and little lumps are formed. Then thirty parts of water are added, after three to five minutes the other half of the fluor-ammonium and floor-acid solution, and the whole is then stirred until the mass shows a viscid pasty consistency and all lumps and white spots have disappeared. The productis then care- -fully strained. The etching on the metal plate is carefully inked with this ink, so that theincised lines are filled in. From the thusprepared metal plate the pattern-print is then transferred, by means of common tissue-paper, in the ordinary manner upon the glass. The transfer then etches the pattern into the glass a dead white in about thirty minutes and is finally washed off with plain water.

The up- I In place of the magnesia alba or carbonate of magnesium also other carbonates, such as carbonate of soda or potassium, may be used, with the result of likewise producing an intense dead White; but the obtained ink would not be of sufficient consistency as to allow of its being lifted out of the deeply-etched metal plate by means of tissue-paper.

The advantages of my new process are apparent. A covering up of the portions not to be etched with body color is no longer necessary, since only the pattern-lines sunk. into the metal plate are inked with the described printing and etching medium, so that only the pattern is transferred to the glass and then directly etched. In the old processes the etching operation took from live to six hours, while with my process thirty miuutessuftice. The separate etching process and also the touching up of the transfer-print before the etching operation is done away with, since the transfer from the etched metal plate is made absolutely clean and sharply defined, and, lastly, while formerly specially-prepared oils were employed for washing off the transfor from the glass now plain water is all that is necessary.

What I claim, and desire to secure by Letters Patent, is-

The process for etching glass, consisting in inking and filling in a pattern, etched into a metal plate and to be transferred unto the glass, with a pasty printing and etching medium, made up of about two parts fluor ammonium, one part fiuor acid, seventy parts carbonate of magnesium, thirty parts white dextrine', twenty parts yellow deXtrine, five parts anilin-black and thirty parts water, transferring the printing and etching medium forming the design by means of tissue-paper to the glass object, allowing it to remain thereon until the desired dead-white effect is obtained and then washing it off with water, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

BEN ZIN DIETH.

Witnesses: V

HANS PAPPENHEIM, .ALVESTO S. Hooun. 

